Product Manual

General instructions
Step Action
1 Install an isolating (disconnector) switch near the compressor.
2 Check the fuses and the setting of overload relay. See Settings for overload relay and
fuses.
3 If fitted, check transformers for correct connection.
4 See Electric cable size for selection of power supply line cable.
Connect the power supply cables to terminals L1, L2 and L3 (terminal block 1X0) and
the neutral conductor (if applicable) to terminal (N). Connect the earth conductor to
terminal PE/GND.
Specific voltage change instructions for G 2 – G 7 with 208 V / 230 V / 460 V cubicle
The standard voltage configuration for the compressor is mentioned on the data plate of the
machine.
When the compressors leave the factory, the units are connected for 230 V / 3 phase.
To modify the wiring for an operating voltage of 208 V or 460 V, the main cubicle should be
rewired as described below:
Modifications to the compressor cubicle:
Step Action
1 Adjust the motor overload (F21) setting.
2 Control transformer (T1) – Move the primary connection from 230V to the desired voltage.
3 Replace the control fuses (F1) 10.3 x 38mm with the ones provided (see further).
Use 0.75A fuses for 460V or 1.5A for 208V.
4 Modify the motor terminal bridge configuration in the cubicle (1X1). See further for details.
5 Replace the voltage sticker by the appropriate voltage sticker provided.
Motor overload relay (F21) setting:
Rotate the adjustment screw (1) on the front of the relay to the required value.
Control transformer (T1):
Move the wire to the terminal marked with the desired voltage (208 V, 230 V or 460 V).
Instruction book
2920 7199 10 51